I can only remember one arc, the setting is a mansion, and I think the game itself was based on a real life game. They can open chests(?), however the item inside it can be good or bad, and there's also a ghost hiding inside one of those chest so they need to avoid it. I can remember that one of the player decided to team up with the ghost itself, and he was planning on killing everyone until he's the only one surviving. He had this stethoscope (?) thingy which can tell if the item inside the chest is good or bad, however the truth is it was the ghost telling him the answer.